In my case I have 197k and EVERY single bushing went bad (body mounts, motor, trans, swaybar, control arms, leaf springs, bushings that hold the front axle up, etc) and rotted apart. I replaced them all with polyurethane ones except for my control arms since they are a pain.

Before I had a MASSIVE vibration and ALOT of play in all bushings. Now the vibration is very little and im happy. Took me damn near 2 years to figure it out and multiple mechanic friends were clue less.

1996 T100, Mickey Thomson Classics, Bridgestone Dueler AT 265/75/16, custom offroad KC's.